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Rain Dialplus 9, OPN display

On my 10 year old Rain Dialplus 9, I have 7 zones active. Now, no matter what I try with zone 1, 2 or 3, when I try to start water in those three zones I get a flashing OPN display. It was sort of sporatic last year, but now nothing. Is that a controller issue or a valve issue. Does 1 value control 3 zones? Just not sure where to start..help